Ok guys, I'm working on a 350, 64 cc alum heads, forged piston etc...Putting values in "Patt Kelley" 's calculator, we got 9.27 for DCR , same number with KB's. KB's also gives 9.98:1 for SCR. Are these safe with pump gas (max 91) or we need to lower this?Any ideas appreciated..

Ok guys, I'm working on a 350, 64 cc alum heads, forged piston etc...Putting values in "Patt Kelley" 's calculator, we got 9.27 for DCR , same number with KB's. KB's also gives 9.98:1 for SCR. Are these safe with pump gas (max 91) or we need to lower this?Any ideas appreciated..

Not knowing any more than this, I wouldn't run a 9.3-ish DCR on 91 octane. But hey- what do I know.

that sounds about right, should be good to go! which calc are you using with the adv. duration? i've had quite some variations from the various calculators when it comes to determining DCR from IVC cam timing (0.050 vs. 0.006, 0.004 etc)

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